The Trinity Cluster is composed of three Roman Catholic Parishes of St. Bridget in Postville; St. Patrick in Monona; and St. Mary in McGregor. Please consult our website for the summer v. winter start times. Mass at St. Patrick Catholic Church in Monona is held every Sunday morning by Rev. Nils Hernandez. Monona's church office hours are Monday - Friday from 8:30 a.m. - 4:30 p.m.